swift234

[SourceKit] Annotate tuple types and nested function types

Move the type callbacks into the respective type/typerepr printers so
taht we get these callbacks even when we print the type directly, or in
a nested fashion.  Also make the returntype more explicit than just
"inside a function type", since visiting the function type currently
visits the input argument tuple (which is different than e.g. the
function *decl* printing, which walks the parameter list explicitly).

rdar://problem/24292226